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PatchSiren cyber security CVE debrief

CVE-2023-43522 Qualcomm, Inc. CVE debrief

CVE-2023-43522 affects multiple Siemens SCALANCE W700 wireless devices and can cause a transient denial of service during key unwrapping when the encrypted key is empty or NULL. The advisory rates the issue HIGH with CVSS 3.1 base score 7.5 because it is network-reachable, requires no privileges or user interaction, and impacts availability. Siemens lists update to V3.0.0 or later as the fix for the affected product set.

Vendor
Qualcomm, Inc.
Product
SCALANCE WAB762-1 (6GK5762-1AJ00-6AA0)
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2025-02-11
Original CVE updated
2025-05-06
Advisory published
2025-02-11
Advisory updated
2025-05-06

Who should care

OT and ICS operators, Siemens SCALANCE W700 owners, and network administrators responsible for wireless infrastructure in industrial environments should prioritize this advisory, especially where the listed SCALANCE WAB/WAM/WUB/WUM variants are deployed.

Technical summary

According to the Siemens and CISA advisory material, the flaw is a transient DoS condition in the key unwrapping process triggered when the supplied encrypted key is empty or NULL. The affected inventory includes 19 Siemens SCALANCE product variants, and the documented remediation is to update to V3.0.0 or later. No confidentiality or integrity impact is stated in the source; the advisory and CVSS vector indicate availability-only impact.

Defensive priority

High for exposed or operationally critical deployments. The issue is remotely reachable and can interrupt availability, so it should be scheduled for prompt remediation in accordance with maintenance constraints.

Recommended defensive actions

  • Identify whether any of the listed Siemens SCALANCE W700 product variants are deployed in your environment.
  • Prioritize upgrading affected devices to V3.0.0 or later using Siemens' remediation guidance.
  • Validate patching in a maintenance window appropriate for OT availability requirements.
  • Inventory and document affected assets so exposure can be tracked across sites and segments.
  • Apply defense-in-depth controls recommended by CISA for industrial control systems, including segmentation and monitored access paths.
  • Monitor vendor and CISA advisories for any follow-on revisions or additional remediation notes.

Evidence notes

The description, CVSS vector, affected product list, and remediation come from the CISA CSAF advisory ICSA-25-044-09 and Siemens reference materials. The CVE was published on 2025-02-11 and revised on 2025-05-06 for typo fixes only, per the supplied timeline. The supplied source corpus lists 19 affected Siemens SCALANCE product variants and a vendor fix of V3.0.0 or later.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-43522 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-43522

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2023-43522 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-43522

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-044-09.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-769027.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-769027.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-044-09

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.